Which statements about the function f(x)=(x-1)(x+7) are true? select
three options.
the vertex of the function is at (-4-15).
the vertex of the function is at (-3,-16).
the graph is increasing on the intervaly> -3.
the graph is positive only on the intervals where y< -7
and where x> 1
the graph is negative on the interval x< -4.